We Are Ophthalmology LTD We Care About Your Health

Over the years, Ophthalmology LTD's name has become associated with the highest quality of comprehensive medical and surgical eye care. Highly trained ophthalmologists David West, Bryan Hammer, Gregory Osmundson, Eric Thomas, Dustin Dierks, Ryan Geraets, Michael Eide, Elizabeth Atchison, and Elise In’t Veld, as well as experienced optometrists Andrea McCann and Emily Walters combine their considerable expertise to give each and every patient the best possible care. Ophthalmology LTD delivers treatment for cataracts, glaucoma, diabetic eye disease, as well as cornea transplants, oculoplastic surgery, retina surgery, vitreoretinal surgery, and pediatric eye care in Sioux Falls.

The Finest Eye Specialists in the Tri-State Area

Ophthalmology LTD brings the finest eye specialists in South Dakota to satellite offices in the tri-state area: Luverne, Pipestone, Worthington and Windom in Minnesota, Rock Valley, Sibley, and Sioux Center in Iowa, as well as Dell Rapids, Madison, Mitchell, and Yankton in South Dakota.


In 1968, Ophthalmology LTD revolutionized eye care by taking a comprehensive approach, bringing patients a full range of vision specialties under one roof. Today, eye care teams across the nation are now mimicking the strategy we have spent more than 50 years perfecting. It is because of this experience and our genuine dedication to our patients that our team is widely considered the finest, most comprehensive group of sub-specialty eye surgeons in the tri-state Siouxland area.

Our Services

Our ophthalmologists have expertise in a wide range of specialties and work as a team to meet your eye care needs.


Not only is cataract treatment the most frequently performed surgery in the United States, it is also one of the most successful. More than 99% of patients who undergo cataract removal rank their vision as significantly improved. Drs. Osmundson, Hammer, Dierks, Eide, In't Veld, and West perform this highly effective procedure.

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Early detection and treatment is the key to preventing vision loss with Glaucoma. More than three million Americans have glaucoma, but only half are actually aware that this "silent thief" is slowly and without warning stealing away their vision, sometimes without any noticeable symptoms. Drs. Osmundson and In't Veld  at Ophthalmology LTD specializes in the diagnosis and treatment of glaucoma.

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Children should have a yearly comprehensive eye exam along with their parents. Many vision problems can be detected early and treated before they become detrimental to a child's development, learning abilities, and every day function. Dr. West of Ophthalmology LTD has 22 years of experience in the evaluation and treatment of children's vision.

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The retina functions much like the film in a camera, and when film is damaged, so is the picture. Our retinal specialists Drs. Geraets, Thomas, and Atchison  offer comprehensive retinal exams and treatment to protect against diseases such as diabetic retinopathy that can damage your retina and vision.

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If a window pane is distorted or marred by imperfections, it is difficult to see out through it clearly. Your cornea is your eye’s window. To keep it clear or to restore it to its proper state, Dr. Eide of Ophthalmology LTD uses his specialty training in corneal diseases to treat dry eye, keratoconus, and other conditions that can cause corneal imperfections.

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When your eyelids, eye sockets, or tear ducts malfunction, or a tumor threatens your vision, Ophthalmology LTD oculoplastic surgeon Dr. Hammer can help. Specializing in procedures that restore clear vision as well as a more youthful appearance, Dr. Hammer treats and manages a wide variety of ocular conditions.

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We are a team of passionate professionals with
caring for patients in South Dakota, Minnesota, & Iowa.

Have a look around, then call, request an appointment online, or come by to learn more about how our team of eye experts can help you and your family.

  • Julie N.

    Very skilled doctors. Pleasant and knowledgeable support staff.

  • Sharon L.

    I highly recommend Dr. Atchison and her team!! The team was very compassionate and calmed my fears when I was referred for my emergency detached retina in June 2021. She preformed the surgery the same afternoon with a successful... read more

  • Pamela K.

    I went to Opthalmology LTD
    and received a thorough cataract exam by their friendly, professional staff. I definitely recommend their office for your vision needs!

  • Lorna V.

    Dr McCann is a down to earth person and very easy to talk to! She is very thorough explains everything. Her staff and everyone there is very nice!

  • Jenna B.

    This is a great place to go if you have any eye problems, the Dr’s are very experienced and answered all of my questions and the wait was very minimal

  • Constance S.

    Great staff. Friendly and helpful. Dr hammer is an amazing and caring physician

  • Gene C.

    All employees are professional & the progress of the appointment goes at a fairly rapid pace. There is some waiting but not overly long periods. I have confidence in Dr's & nurses that my care will be well done.

  • Lori H.

    Thank you Dr Emily Walters and staff for your wonderful care! You listened to my concerns and answered my questions so I could understand. Will highly recommend Opthamology, Ltd.!

  • Aimee H.

    Extremely professional and caring! Dr. Walters was able to see me as same day emergency. She was so thorough and kind as she walked me through what was going on with my vision. She had also looked at my... read more

  • Beth E.

    Dr Dierks is a wonderful doctor. My Mom had a difficult cataract to remove. Thanks to Dr Dierks my Mom has much improved eyesite.

  • Renee' R.

    Ophthalmology LTD is a wonderful place to have any procedure done. They are very caring, very knowledgeable and always very accommodating. Dr. Eide is a very good doctor who is extremely knowledgeable in his field. He performed two cataract surgeries... read more

  • Kenneth H.

    Very good turnout - surgery , follow up instructions, very professional staff and surgeon

  • Russ S.

    Great experience. Very nice and knowledgeable staff.

  • Barb G.

    Everyone was very friendly and helpful. Enjoyed my visit

  • Julie B.

    Very upbeat and professional staff.

  • Bonnie H.

    Dr Osmundson has taken such good care of my glaucoma disease for so many years that each time I leave the clinic I'm elated! My eye pressures continue to go down steadily. He checks everything so thoroughly I would recommend... read more

  • rod w.

    Dr Dierkes and his staff were amazing nearly trouble free start to finish

  • Jeannine R.

    I had an eye exam by Dr Walters for the first time and by the time I left I felt like I had known her for along time! She was thorough, knowledgeable and so so friendly! I would... read more

  • Teri M.

    Always a pleasurable experience!!!

  • Mike C.

    Great Experience!!! I was very impressed with the professionalism they expressed to me

  • Russ S.

    Dr. Osmundson has demonstrated his expertise in managing my glaucoma. During our appointments he has always spent the amount of time I felt was needed to examine my eyes and test results to detect changes in my vision. Although glaucoma... read more

  • Kristi D.

    Wonderful experience with Opthalmology LTD. The entire staff is warm & welcoming from start to finish. Dr Osmundson is extremely knowledgeable and personable. I am so thankful he's my doctor!

  • Paul C.

    Great experience with Ophthalmology Ltd. From checking in, several exams and visiting with Dr. Osmundson. Great staff, kind, understanding and courteous. Looking forward to getting this done!

  • Laura S.

    Was a very positive visit. Everyone was super nice!! Explained everything

  • Linda C.

    All of the customer relations, associates and doctors are knowledgeable and professional with my best interests in mind.

  • Kenny L.

    My eye surgery was my first surgery in 70 years!It caused a little anxiety to say the least.Dr Thomas and the ENTIRE staff were absolutely fantastic!PoliteInformativeTimelyHelpfulIt was great and recovery is ahead of schedule!Thank you!

  • Gallego d.

    Excellent service from start to finish. Beautiful establishment filled with caring professional employees.

  • Diane E.

    Very professional and the staff is amazing. Dr. Eric Thomas is absolutely incredible. I would highly recommend.

  • Monte T.

    I always enjoy coming here because Dr. Thomas is the best. Very friendly along with his staff, there very polite and courtesy to me.

  • LyleBetty A.

    Very timely and the utmost in professional treatment.

  • Karen G.

    Everything! Not a non caring person in the building, everyone is kind and cheerful. The staff certainly goes out of their way to be helpful, even warming eye drops in their pockets!
    The doctors are the best in their field. Putting...
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  • Linda S.

    My son had been seeing Dr. West for 23 years. We always have great experiences with him and his nurse, Cindy. The schedule is always full but they send out reminders to get your appointments before they fill... read more

  • Roger N.

    The appointment was very good, very professional and very helpful.

  • Deena P.

    Great staff, caring, organized. Appreciated them all.

  • nancy W.

    Enjoyed the visit. Was in and out within an half hour.Very courteous staff.Dr. Is awesome.

  • Gayle H.

    I would recommend them all for their expertise. The staff is very friendly and helpful. I see Dr. McCann and Dr. Bryan Hammer and they are very good. I would recommend them or any of the staff. Thanks so much!

  • Hajrije M.

    Dr. Walters was great! She was super nice and made me feel very comfortable.

  • Gayle B.

    Excellent care! I was an emergency appointment and was seen right away. Dr. Atchison was thorough and experiencedI left feeling confident the laser treatment of my torn retina was exactly what was needed to save my vision.

  • Lynelle H.

    I have seen Dr Eide and Dr Thomas most recently and have been going there for years. Everyone is so helpful and nice. They truly care about their patients!

  • Steven J.

    Very thorough and accurate in their diagnosis and treatment. I am very happy going there and everyone is so friendly and Dr. Gareats is a great doctor. Very happy with my treatments and also the outcome.

  • Sue B.

    Professional and very friendly staff. Each stage of the exam was explained in detail. The doctor went through my options, gave me his recommendations and answered all of my questions. I was able to schedule treatment during that visit quickly... read more

  • Janice B.

    Great personal service well organized

  • Terri P.

    Dr McCann and her staff were so nice and reassuring. I had an accident that involved my eye. The receptionist got me in to see Dr McCann the same day I called and I was a new patient to her.... read more

  • Daniel B.

    Dr West is very professional and friendly. Highly recommend him to anyone that is in need of laser treatment. I couldn’t be more happy with the results.

  • Larry H.

    Had a great experience with Dr. Andrea McCann and her nurse. They are very professional and courteous..

  • Lisa N.

    Ophthalmology LTD/Dr. West has provided speciality optical care for our son since he was an infant. Having been born with Strabismus he required significant ongoing treatment to allow for optimal performance and optical health. The care team of Dr. West... read more

  • Kim H.

    Very detailed. Explained everything. Felt relief. and in great hands. Thank you

  • Sharon S.

    Everyone very knowledgeable and polite.

  • Kay N.

    I know they were very thorough with the tests etc. All the receptionists, nurses and
    the Doctor were very pleasant and very
    helpful. I recommend anyone to go to
    Ophthalmology LTD.

  • Janice K.

    I received excellent care while a patient at Ophthalmology. They are very well organized with staff and equipment. I am very happy that I picked them to take care of me.